Army Lieutenant Colonel Valerie Henderson told the press that the network was taken offline by military officials as a precaution, not by a third party.

She went on to say on Tuesday:

“We continue to identify and mitigate cybersecurity risks across our networks, with those goals in mind, we have taken the Joint Staff network down and continue to investigate.”

We will continue to keep you updated as more info becomes available.

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From Reuters:

An unclassified email network used by Army General Martin Dempsey and other members of the U.S. military’s Joint Staff has been taken off line because of suspicious activity, a Pentagon spokeswoman said on Tuesday.

Army Lieutenant Colonel Valerie Henderson said the unclassified email network for all users on the Joint Staff was taken offline by the Defense Department because of suspicious activity noted over the weekend and is “currently down.”